Q: What is the correct formula for calculating molarity ($$M) of a $$solution?

$$M = \frac{\text{amount of solute (mol)}}{\text{volume of solution (L)}}$$

Q: What is the net ionic equation for the reaction between aqueous HBr and aqueous LiOH?

$$\text{H}^+(aq) + \text{OH}^-(aq) \rightarrow \text{H}_2\text{O}(l)$$

Q: Which of the following reactions is a redox reaction?

$$2\text{Na}(s) + \text{Cl}_2(g) \rightarrow 2\text{NaCl}(s)$$

Q: Which of the following is the net ionic equation for the reaction between hydroiodic acid and calcium sulfide?

$$2\text{H}^+(aq) + \text{S}^{2-}(aq) \rightarrow \text{H}_2\text{S}(g)$$

Question 1

Which of the following best describes a precipitation reaction as used in molecular gastronomy?

Accepted Answer

A reaction where a solid forms when two solutions are mixed.

Question 2

A student prepares a solution by dissolving 25.5 g of KBr in enough water to make 1.75 L of solution. What is the molarity of the solution? (Molar mass of KBr = 119.00 g/mol)

Accepted Answer

$$0.122\,	ext{M}$$

Question 3

Which of the following statements about concentrated and dilute solutions is correct?

Accepted Answer

A concentrated solution contains a relatively large amount of solute.

Question 4

What is the correct formula for calculating molarity ($$M) of a $$solution?

Accepted Answer

$$M = \frac{	ext{amount of solute (mol)}}{	ext{volume of solution (L)}}$$

Question 5

How many liters of a $$0.125\,	ext{M}$$ NaOH solution are required to provide $$0.255\,	ext{mol} of $$NaOH?

Accepted Answer

$$2.04\,	ext{L}$$

Question 6

Which of the following equations is used to calculate the final volume when diluting a solution?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 7

A solution is prepared by mixing $$0.150\,	ext{L} of$$ $$0.175\,	ext{M} Pb(NO$_3$$)$$_2$$ with KCl solution. According to the equation $$	ext{Pb(NO}_3)_2(aq) + 2	ext{KCl}(aq) ightarrow 	ext{PbCl}_2(s) + 2	ext{KNO}_3(aq)$$, what volume of $$0.150\,	ext{M}$$ KCl is needed to completely react?

Accepted Answer

$$0.350\,	ext{L}$$

Question 8

Which of the following compounds is soluble in water according to the solubility rules?

Accepted Answer

Ca(NO$$_3$$)$$_2$$

Question 9

Which of the following solutions will conduct electricity?

Accepted Answer

$$1.0\,	ext{M}$$ KBr

Question 10

Which ion, when present in a compound, guarantees that the compound is soluble in water with no exceptions?

Accepted Answer

NO$$_3^-$$

Question 11

What is the net ionic equation for the reaction between aqueous HBr and aqueous LiOH?

Accepted Answer

$$	ext{H}^+(aq) + 	ext{OH}^-(aq) ightarrow 	ext{H}_2	ext{O}(l)$$

Question 12

Which of the following best describes the difference between the charge of a polyatomic ion and the oxidation states of its constituent atoms?

Accepted Answer

The charge of a polyatomic ion is a property of the entire ion, while the oxidation states are assigned to each individual atom.

Question 13

Assign the oxidation state to sulfur in SO$$_3.$$

Accepted Answer

$$+6$$

Question 14

Which of the following reactions is a redox reaction?

Accepted Answer

$$2	ext{Na}(s) + 	ext{Cl}_2(g) ightarrow 2	ext{NaCl}(s)$$

Question 15

Which metal is most easily oxidized according to the activity series?

Accepted Answer

Na

Question 16

A 10.0 mL sample of $$0.20\,	ext{M}$$ HBr is titrated with $$0.10\,	ext{M}$$ NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$20.0\,	ext{mL}$$

Question 17

Which of the following statements is true regarding redox reactions?

Accepted Answer

In a redox reaction, any increase in the oxidation state of a reactant must be accompanied by a decrease in the oxidation state of another reactant.

Question 18

Which of the following is the net ionic equation for the reaction between hydroiodic acid and calcium sulfide?

Accepted Answer

$$2	ext{H}^+(aq) + 	ext{S}^{2-}(aq) ightarrow 	ext{H}_2	ext{S}(g)$$

Chapter 5: Introduction to Solutions and Aqueous Reactions – Study Notes

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